Exposures test 3

This is accomplished by gain images and offset images

Flatfielding

Pixel shift is used to correct for patient motion.

Reregistering

The national standard for image transmission in tele-radiology is what format?

DICOM

One of the main purposes of the ACR is?

Ensure patient dose follows the ALARA principles

What is the basic photo metric unit?

Lumen

The manner concerning how many computers can be connected describes what term?

Network

What system is used to schedule exams?

RIS

Quantitative radiology is used to?

Computation of mean pixel values within a ROI

What is determined by grayscale bit depth and matrix size

Image file size

What is the formula for pixel size

FOV/matrix size

Which of the following matrices will create an image with the smallest pixels?

2048x2048

Which of the following matrices will create an image with the greatest spatial resolution?

2048x2048

1/2 pixel size is the formula to solve for?

Spatial frequency

What does MIMPS stand for?

medical image management and processing system

What is the effect to scale of contrast latitude, and wavelength as kvp is increased?

Contrast decrease

Latitude becomes wider

Wavelength gets shorter

Grayscale bit depth and matrix size

Determines image file size

Best way to view a digital display monitor

Straight on

Standard PACS system to receive/read images

DICOM/HL7

Computation of mean pixel value within a ROI

Quantitative radiology

Average size of CR or DR image file

200 MB

Using two screen in imaging

Results in higher MTF

The EMR is part of what system

HIS

Can happen if incomplete erasure of IP

Ghost image

Determines spatial resolution in digital imaging

Ratio of FOV to matrix size

Denser breast tissue is best imaged with this type or mammography system

Digital

Performed automatically; performed manually

Preprocessing; post processing

Makes computed radiology screens respond to radiation

Photostimulable luminescence (phosphor)

State of material between a solid and a liquid

Liquid crystal

Represent 0 or 1

Bit

Improved contrast resolution and wide exposure latitude

CR image characteristics

high DQE=_______pt dose

Lower

Corrected by the application of offset voltage

Image lag

Determines image brightness in digital radiography

Pixel values

The portion of useful imaging forming X-rays

Signal

How to ID a medical flat panel DDD

The number of pixels

Used to describe the luminous intensity of a DDD

Cosine law

Preprocessing technique used to correct for irregular pattern over the image through auto calibration called gain images and offset images

Flatfielding

Basic photo metric unit

Lumen

Almost all medical flat panel digital display devices are?

Color liquid crystal displays

Handles the PSP

Reader

Viewing workstations and secretarial workstations

Clients in a PACS network

Technique change in both analog and digital imaging that reduces patient dose of radiation

Use higher kvp techniques

Type of processing that includes image inversion, annotation, and pixel shift

Post processing

Not part of a PACS system

Storage of film

Transfer of images to a remote site

Teleradiography

Offset images and gain images

Automatic calibration used for flat fielding

Used in CR for latent image formation

PSP

Registering an image to correct for patient motion

Pixel shift

PACS stands for?

Picture Archiving and Communication System

Level of ambient light for a digital workstation

Near darkness

Imaging plate (IP)

Cassette in CR

Another name for spatial resolution

Image detail

Increased distance from light source causes decreased luminous intensity

Inverse square law

The study of the response was f the human eye to light

Photometry

Principle source of noise in CR

Scatter radiation

Three organizations which created the technical standard for electronic practice of medical imaging

AAPM, ACR, SIIM

2 bytes in computer language =??

Word

Purpose of image subtraction

Enhance contrast

Systems that includes scheduling of exams and emails

RIS